Accuracy: The closeness of a measurement to the true or actual value

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Presentation transcript:

Accuracy: The closeness of a measurement to the true or actual value Accuracy: The closeness of a measurement to the true or actual value. of what is being measured. BEING RIGHT! Accurate: Your measurement = 30.5 cm Actual length = 30.5

Precision: how SPECIFIC a measurement is Less Precise - - - - - - - - - - -More Precise 10 m 10.5 m 10.56 m 12 m 9.8 m 10.52 m 9 m 10.3 m 10.55 m Groups of measurements that are CLOSE in range to each other = more precise More SIG. FIGS. = more precise

Precise instruments; Precise measurements Most precise (least estimation) Least precise (most estimation)

Precision Which ruler is the most precise? Which ruler is not accurate?

Precision Precision of calculated answers is limited by the least precise measurement. Ex: 2.5 cm + 2.25 cm = 4.75  4.8 Measurements can be precise, but not accurate if an instrument is not calibrated correctly.

Precision & Significant Figures Answers cannot be more precise than the least precise information given Examples 15.5 + 8.22 = 23.72 Answer: 23.7 In + and - : Keep same # of decimal places

Answers that Reflect Precision http://www.fordhamprep.com/gcurran/sho/sho/lessons/lesson23.htm ADDING OR SUBTRACTING: Answer can only show as many decimal places as the measurement having the fewest number of decimal places. Example: When we add 3.76 g + 14.83 g + 2.1 g = 20.69 g Our final answer is 20.7 g

Practice Quizzes on accuracy & precision: http://www.fordhamprep.com/gcurran/sho/sho/lessons/lesson23.htm Key Points: Accuracy – Are your measurements close to the true value? Precision – Are a group of measurements close to each other or in agreement? More precise instrumentation leads to greater precision.